This data set for the ISLSCP Initiative II data collection provides near surface meteorological variables, fluxes of heat, moisture and momentum at the surface, and land surface state variables, all with a spatial resolution of 1 degree in both latitude and longitude. There are four temporal categories of data: time invariant and monthly mean annual cycle fields (together referred to as "fixed" fields), monthly mean fields, monthly 3-hourly diurnal, and 3-hourly fields. Two types of variables exist in this data; instantaneous fields (primarily state variables), and average fields (primarily flux fields expressed as a rate).
The Center for Ocean-Land Atmosphere Studies (COLA) near-surface data set for ISLSCP II was derived from the National Centers for Environmental Prediction (NCEP)/Department of Energy (DOE) Atmospheric Model Inter-comparison Project (AMIP-II) reanalysis (http://www.cpc.ncep.noaa.gov/products/wesley/reanalysis2/), covering the years from 1979-2003. The data set for ISLSCP II covers the period from 1986 to 1995. The purpose of the reanalysis was to provide an improved version of the original NCEP/National Center for Atmospheric Research (NCAR) reanalysis for General Circulation Model (GCM) validation. To co-register the NCEP/DOE reanalysis on the ISLSCP 1-degree grid, the reanalysis data set was regridded from its native T62 Gaussian grid) resolution (192 x 94 grid boxes globally) to 1-degree ISLSCP II required resolution.
There are 136 compressed (.tar.gz) data files with this data set. When extrapolated, the individual data files are in ASCII (.asc) format.
This data set is one of the products of the International Satellite Land-Surface Climatology Project, Initiative II (ISLSCP II) data collection which contains 50 global time series data sets for the ten-year period 1986 to 1995. A complete description of the data, it's derivation, acknowledgements, and references provided by the ISLSCP II Data Management Staff is included with this data set as a companion file named 1_ncep_met_doc.pdf.
ISLSCP II is a consistent collection of data sets that were compiled from existing data sources and algorithms, and were designed to satisfy the needs of modelers and investigators of the global carbon, water and energy cycle. The data were acquired from a number of U.S. and international agencies, universities, and institutions. The data and documentation have undergone two peer reviews.
ISLSCP is one of several projects of Global Energy and Water Cycle Experiment (GEWEX) [http://www.gewex.org/] and has the lead role in addressing land-atmosphere interactions -- process modeling, data retrieval algorithms, field experiment design and execution, and the development of global data sets.
Cite this data set as follows:
Dirmeyer, P., M. Zhao, G. White, and W. Ebisuzaki. 2014. ISLSCP II Reanalysis Near-Surface Meteorology Data. In Hall, Forrest G., G. Collatz, B. Meeson, S. Los, E. Brown de Colstoun, and D. Landis (eds.). ISLSCP Initiative II Collection. Data set. Available on-line [http://daac.ornl.gov/] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA. http://dx.doi.org/10.3334/ORNLDAAC/1226
The archived data sets for ISLSCP II have been organized by categories. This data set is in the Near-Surface Meteorology category.
Data Set Spatial Extent: Global
Westernmost Longitude: -180 W
Easternmost Longitude: 180 E
Northernmost Latitude: 90 N
Southernmost Latitude: -90 S
Projection: Geographic
Data Set Spatial Resolution: one degree in both latitude and longitude
Data File Format
There are 136 compressed data files (.tar.gz) with this data set. The files are in standard arc/info ASCII grid format (.asc). The data are structured so that the upperleft corner of the first pixel is located at 90 North latitude and 180 West longitude. Each pixel represents a 1 by 1-degree area.
Table 1. Compressed file names and descriptions
| Compressed File Names | Number of Files in Compressed File | Description |
|---|---|---|
| FIXED-FIELDS DATA FILES-data are for the years 1986-1995 | ||
| N2_fixed_1d.tar.gz |
27 | When extrapolated, the files are named N2_variable_fixed_1d_mZZ.asc. The variables include: Snow-free surface albedo (falbedo) Orographic height above MSL (forogrd) Plant resistance function (fresis) Surface roughness length for momentum and heat (frough) Data mapping mask (imask) |
| MONTHLY DATA FILES | ||
| N2_snc_1d_monthly.tar.gz | 120 |
Average files ("av" in file names) for the years
1986-1995. Variable=Fraction of snow cover (snc) |
|
N2_snd_1d_monthly.tar.gz |
120 |
Average files ("av" in file names) for the years
1986-1995. Variable=Snow cover in terms of water (snd) |
|
N2_sw10_1d_monthly.tar.gz |
480 |
Maximum and minimum values, and standard deviation ("mx, mn, and sd" in
file names) for the years 1986-1995. Variable= (sw) |
|
N2_sw200_1d_monthly.tar.gz |
480 |
Maximum and minimum values, average, and standard deviation ("mx, mn, av
and sd" in file names) for the years 1986-1995. Variable=Subsurface layer (10-200 cm) volumetric soil moisture (sw200) |
|
N2_t10_1d_monthly.tar.gz |
480 |
Maximum and minimum values, average, and standard deviation ("mx, mn, av
and sd" in file names) for the years 1986-1995. Variable=Surface layer (0-10 cm) soil temperature (t10) |
|
N2_t200_1d_monthly.tar.gz |
480 |
Average files ("av" in file names) for the years
1986-1995. Variable=Subsurface layer (10-200 cm) soil temperature (t200) |
| 3-HOURLY DIURNAL FILES | ||
| N2_dlw_1d_diurnal.tar.gz |
960 |
Average files ("av" in file names) for the years
1986-1995. Variable=Surface downward long wave radiation (dlw) |
| N2_dsw_1d_diurnal.tar.gz |
960 |
Average files ("av" in file names) for the years
1986-1995. Variable=Surface downward short wave radiation (dsw) |
| N2_lh_1d_diurnal.tar.gz |
895 | Average files ("av" in file names) for the years 1986-1995. Variable=Surface latent heat flux (lh) |
| N2_prec_1d_diurnal.tar.gz |
960 | Average files ("av" in file names) for the years 1986-1995. Variable=Total precipitation rate (prec) |
| N2_pres_1d_diurnal.tar.gz |
960 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Surface pressure (pres) |
| N2_roff_1d_diurnal.tar.gz |
960 | Average files ("av" in file names) for the years 1986-1995. Variable=Surface runoff (roff) |
| N2_sh_1d_diurnal.tar.gz |
668 | Average files ("av" in file names) for the years 1986/01/01-1993/06/30. Variable=Surface sensible heat flux (sh) |
| N2_snlw_1d_diurnal.tar.gz |
685 | Average files ("av" in file names) for the years 1986-1995 (there are no files for 1992 or 1993). Variable=Surface net long wave radiation (snlw) |
| N2_snr_1d_diurnal.tar.gz |
960 | Average files ("av" in file names) for the years 1986-1995. Variable=Snowfall rate (snr) |
| N2_snsw_1d_diurnal.tar.gz |
960 | Average files ("av" in file names) for the years 1986-1995. Variable=Surface net short wave radiation (snsw) |
| N2_spfh_1d_diurnal.tar.gz |
864 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Specific humidity at 2 m AGL (spfh) |
| N2_tmax_1d_diurnal.tar.gz |
960 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Maximum of temperature at 2 m (tmax) |
| N2_tmin_1d_diurnal.tar.gz |
960 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Minimum of temperature at 2 m AGL (tmin) |
| N2_tmp_1d_diurnal.tar.gz |
960 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Temperature at 2 m AGL (tmp) |
| N2_tnlw_1d_diurnal.tar.gz |
960 | Average files ("av" in file names) for the years 1986-1995. Variable=TOA (Top of Atmosphere) outgoing long wave radiation (tnlw) |
| N2_tnsw_1d_diurnal.tar.gz |
960 | Average files ("av" in file names) for the years 1986-1995. Variable=TOA (Top of Atmosphere) net short wave radiation (tnsw) |
| N2_u10_diurnal.tar.gz |
960 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Zonal component of wind at 10 m AGL (u10) |
| N2_ustr_1d_diurnal.tar.gz |
960 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Zonal wind stress (ustr) |
| N2_v10_1d_diurnal.tar.gz |
960 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Meridional component of wind at 10 m AGL (v10) |
| N2_vstr_1d_diurnal.tar.gz |
960 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Zonal wind stress (vstr) |
| 3-HOURLY FILES- note that there are 10 files per variable (for each year of data) | ||
| N2_crp_1d_xxxx_3hourly.tar.gz | 29,200 | Average files ("av" in file names) for the years 1986-1995. Variable=Convective precipitation rate (crp) |
| N2_dlw_1d_xxxx_3hourly.tar.gz | 24,328 |
Average files ("av" in file names) for the years
1987-1995. Variable=Surface downward long wave radiation (dlw) |
| N2_dsw_1d_xxxx_3hourly.tar.gz | 28,224 |
Average files ("av" in file names) for the years
1986-1995. Variable=Surface downward short wave radiation (dsw) |
| N2_prec_1d_xxxx_3hourly.tar.gz | 27,744 | Average files ("av" in file names) for the years 1986-1995. Variable=Total precipitation rate (prec) |
| N2_snlw_1d_xxxx_3hourly.tar.gz |
29,200 | Average files ("av" in file names) for the years 1986-1995. Variable=Surface net long wave radiation (snlw) |
|
N2_snr_1d_xxxx_3hourly.tar.gz |
29,200 | Average files ("av" in file names) for the years 1986-1995. Variable=Snowfall rate (snr) |
|
N2_snsw_1d_xxx_3hourly.tar.gz |
29,200 | Average files ("av" in file names) for the years 1986-1995. Variable=Surface net short wave radiation (snsw) |
|
N2_spfh_1d_xxxx_3hourly.tar.gz |
28,712 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Specific humidity at 2 m AGL (spfh) |
|
N2_tmp_1d_xxxx_3hourly.tar.gz |
29,200 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Temperature at 2 m AGL (tmp) |
| N2_w10_1d_xxxx_3hourly.tar.gz |
2,484 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Wind speed at 10 m AGL (w10) |
| N2_snd_1d_xxxx_3hourly.tar.gz | 29,200 | Instantaneous files ("in" in file names) for the years 1986-1995. Variable=Snow cover in terms of water (snd) |
Please refer to the companion files 0_ncep_met_readme.txt and 1_ncep_met_doc.pdf for additional information on the data file contents and naming conventions.
These data are available through the Oak Ridge National Laboratory (ORNL) Distributed Active Archive Center (DAAC) [http://daac.ornl.gov].
E-mail: uso@daac.ornl.gov
Telephone: +1 (865) 241-3952
Ebisuzaki, W., M. Kanamitsu, J. Potter, and M. Fiorino, 1999: An Overview of Reanalysis-2. Proc. of 23rd Annual Climate Diagnostics and Prediction Workshop, Miami, Florida (Oct 26-30, 1998). U.S. Dept. of Commerce, 119-122.
Kanamitsu, M., W. Ebisuzaki, J. Woollen, J. Potter and M. Fiorino, 2000: Overview of NCEP/DOE Reanalysis-2. Proc. of the 2nd WCRP International Conf. on Reanalyses, 23-27 Aug. 1999, Wokefield Park, UK. World Meteorological Organization, Geneva, Switzerland, WCRP-109, WMO/TD-No. 985, 1-4.
Kanamitsu, M., W. Ebisuzaki, J. Woollen and S.-K. Yang, 2002: NCEP/DOE AMIP-II Reanalysis (R-2). Submitted for publication in Bulletin of the American Meteorological Society.
Kistler, R., E. Kalnay, W. Collins, S. Saha, G. White, J. Woollen, M. Chelliah, W. Ebisuzaki, M. Kanamitsu, V, Kousky, H. van den Dool, R. Jenne, and M. Fiorino, 2001: The NCEP-NCAR 50 year reanalysis monthly means CD-ROM and documentation. Bull. Amer. Meteorol. Soc., 82, 247-267.
Simmons A.J. and J.K. Gibson, 2000. The ERA-40 Project Plan, ERA-40 Project Report Series No. 1, ECMWF, Reading RG2 9AX, UK., 63pp.